@misc{indiciaebebd06cd3934,
  title = {Mineral deposits and occurrences in Massachusetts and Rhode Island, exclusive of clay, sand and gravel, and peat},
  author = {Nancy C. Pearre},
  year = {1956},
  doi = {10.3133/mr4},
  url = {https://pubs.usgs.gov/publication/mr4},
  note = {Source identifier: mr4}
}